Polarity Independent Power Design

Discussion in 'General Electronics Chat' started by cackharot, Feb 10, 2011.

  1. cackharot

    Thread Starter New Member

    Feb 2, 2011
    13
    1
    Hi,

    I need to design a power supply circuit with the following spec

    1) AC input 120-240V AC 50/60Hz or +-48V DC
    2) DC output 24V at 1.5A

    I know the normal part that 240VAC to 24VDC using transformer, rectifier, filter and Linear regulator using LM317.
    Buy I need help regarding how to convert +-48DC to 24V DC.

    Looking forward to ur help!

    Thanks.
     
  2. tom66

    Senior Member

    May 9, 2009
    2,613
    214
    Well, you could use the same bridge rectifier, and put the resulting ~46VDC into a DC-DC converter.
     
  3. cackharot

    Thread Starter New Member

    Feb 2, 2011
    13
    1
    Sorry, I dont actually get u. Could u post a rough circuit.
    Thanks
     
  4. tom66

    Senior Member

    May 9, 2009
    2,613
    214
    I don't have a circuit. But you can have a look at suppliers like National Semiconductor. Their "Webench" will give you a circuit. Input DC volts 25V to 50V (give some error on both ends), output voltage 24V at 1500mA.
     
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